Charles a



r C. A. EATON.

Burglar Alarm.

No.- 68,857. Patented Sept.17 1867.

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CHARLES A. EATON, or MINNEAPOLIS, MINNESOTA.

Letters Patent No. 68,857, dated September 17, 1867.

IMPROVED BURGLJAR-ALARM.

TO ALL WHOM IT MAY GONQERN:

Be it known that I, CHARLES A. EATON, of Minneapolis, in the county ofHennepin, and State of Minnesota, have invented a new and'useful machinecalled a Burglar-Alarm, for the purpose of protection from i clandestineentries by burglars; and I do hereby declare that the following is afull, clear, and exact description of the mode of construction andoperation of the same, reference being had to the annexed drawings andletters of reference marked thereon, making a part of this amendedspecification.

The construction of my alarm is as follows: A A represent an oblongwooden block, on the top of which is fastened a piece of metal, ofcorresponding size. Upon the top and at the left end of the same isfastened a second piece of metal, represented by B, which has twoupright arms of unequal length, the shorter arm, a, terminating in asmall cylindrical holder of suitable shape and-sizeto contain the tip ofa singlepercussion match The longer arm, by means of an elastic cord orband, 6, is made to hold a torpedo, a, charged with powder, and whichhas a quick fuse. O is a cock of brass or other metal, which is impelledby a springgd,

underneath-. On the left extremity of the cock, and fastened thereto bya slot or -ri vet,- or other means, is a small bit of sheet metal, e,which is so perforated that the outer surface affords friction for theeasy ignition of the percussion match in the holder at. D is, a trigger,by means of which the cock is set and sprung. E is a. small head orbutton, from whichan elastic cord runs to the arm of the trigger. F is ametallic slide, which can be applied either to the back side or underside of the block A, by means of grooves cut lengthwise the block, andcorresponding flanges along the slide. There are also short hooks orcatches on either end of the.

slide, which turn in opposite'directions. G is a pointed book, whichconnects with the catch on the left of the slide by an elastic cord orband.

The operation of my alarm is as follows: Place the slide upon the casingof the door, securing it firmly I with thehook or catch on the right endpressed closely into the inner edge, and with the hook G caught overupon the outer edge of the casing, the width of which determines thelength of the elastic, as'H H. Then with the cock set, insert the block,by the grooves, upon its back side, into the slidejust far enough forthe edge of the opening door to strike the trigger D. See that thepercussion match and the torpedo are properly adjusted in the arms a andb, so that the match-blaze will ignite the fuse of. the torpedo. Onopening the door the cock will be sprung and the torpedo fired with aloud report. If the door opens to the left, reverse the alarm, placingit top downwards; otherwise adjust as before.

My alarm may also be usefully applied ton. window, as follows: Havingfirst fastened the slide to the casing, insert the block by its groovesupon the under side, until the trigger is brought inposition for therising window to operate with the same result as the opening door. Ifdesirable the alarm can easily be made a fixture by cutting of thecatches upon the ends of the slide, and fastening it to casing by nailsor screws, The torpedo I use contains no ball, but only powder and somedry non-combustible substance, as flour used as packing. It may be firedwithout danger while holding the alarm in the hand, and the same cap maybe re-filled and fired repeatedly. e

What I claim as my invention, and desire to secure by Letters Patent,is- 1. The combination of the perforated plate e with the cock 0, asandfor the purpose specified.

2. The combination of cock and trigger O D with block-holder and slide AB F, substantially as and for l the purpose described.

. I CHARLES A. EATON.

Witnesses:

GHAs. E. FLANDRAU, SAMUEL A. WILSON. A

